v-tec

hmooblis · #1 10-20-2003, 08:26 PM

why do people take out the vtec system for high hp cars? nissan does the same with their vvti(vtec like) system.

90civicracer · #2 10-20-2003, 10:17 PM

Isn't it Toyota that has the VVT-i system and not Nissan?

hmooblis · #3 10-20-2003, 10:27 PM

nissan has a similar system, but back to the question

90civicracer · #4 10-20-2003, 10:30 PM

Maybe its so they can have lower compression ratios...i have no clue, i am just taking a guess. Anyone who actually knows what their talkin about wanna add in?

hmooblis · #5 10-20-2003, 10:40 PM

i think it has to do with the cam profile and lift but i don't know exactly what.

whtteg · #6 10-20-2003, 10:52 PM

It is because they have cams that only have the vtec lobes on them and there is no reason for the smaller lobes so it runs on vtec all the time. This is done to shave weight off of the cams so that they can free up a little hp. The cams are called vtec killers.

hmooblis · #7 10-20-2003, 11:00 PM

also, vtec wasn't made for high hp, instead it was made for the economy

whtteg · #8 10-20-2003, 11:02 PM

Quote:

Originally Posted by hmooblis

also, vtec was't made for high hp, instead it was made for the economy

Ok newbie stop posting crap that is not true. Please stop posting stuff like this because it makes you look dumb

hmooblis · #9 10-20-2003, 11:08 PM

sorry but i'm trying to help right

LancasterWannaBe · #10 10-21-2003, 01:17 AM

there is an economy version VTEC...

Spectre927 · #11 10-21-2003, 01:27 AM

VTEC-E is in some older civics and I believe it is for economy. It actually disabled one of the 2 intake valves, and I read Honda was able to get A/F ratios of 20:1. GSRs, Type Rs and SIs are purely power, and apparently(from what I've read) VTEC is Hondas answer to turbocharging because they felt turbos didn't get enough fuel mileage. VTEC changes the valves timing, but depending on how it does that will depend on the results.

Spectre927 · #12 10-21-2003, 01:30 AM

The designed-for-power VTEC keeps the valves open more and longer letting in more air and fuel. You'll get noticeably less MPG if you hit VTEC a lot. Try it

94tegRS · #13 10-21-2003, 01:57 AM

Quote:

Originally Posted by hmooblis

sorry but i'm trying to help right

but youre trying to help when you dont know what your talking about, someone could have read that post, which you phrase it like you know what your talking about, and then go out and buy a LS and not a GSR cuz he thinks it will be faster.

also doesnt the newer civic HX's have vtec e, just not the 3 stage like that old civic did.(if you arent sure put it like a question like I do

)

Spectre927 · #14 10-21-2003, 02:14 AM

Quote:

Originally Posted by 94tegRS

but youre trying to help when you dont know what your talking about, someone could have read that post, which you phrase it like you know what your talking about, and then go out and buy a LS and not a GSR cuz he thinks it will be faster.

also doesnt the newer civic HX's have vtec e, just not the 3 stage like that old civic did.(if you arent sure put it like a question like I do

)

I think so(I never see it VTEC advertised with the HX). But Honda probably likes VTEC to be associated with power and wouldn't like somebody to think, "hey an HX has VTEC," then drive it, be dissapointed and talk smack. When the HX is under 2500, its only opening 1 valve and that valve is lifted higher and longer. At higher RPMS, both of the valves will take that higher and longer lift giving it a slight boost in power(if you buy a car solely for economy, you probably won't do this anyway). So I guess even the economy VTEC is better than no VTEC... naturally aspirated of course...

LancasterWannaBe · #15 10-21-2003, 04:34 AM

Quote:
The designed-for-power VTEC keeps the valves open more and longer letting in more air and fuel. You'll get noticeably less MPG if you hit VTEC a lot. Try it

No Shit Sherlock! You at a higher RPM (like 6k right?) so even if you don't have a VTEC head you'll be getting way less mileage. LOL.

I don't think you can say "when you Hit VTEC" or "when VTEC kicks in" since variable valve timing isn't something that just "kicks in". Changing cam profiles doesn't mean you've hit VTEC or that you're now running on it, it just means the engine has multiple cam profiles and can vary between them, so they named it VTEC. It isn't some special point you reach or a button you push, it's just an engine design.
(None of this is to attack anyone BTW)

There's an article on Honda's VTEC in the engineering/technical forum:
http://www.automotiveforums.com/vbul...ad.php?t=77265

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